[mapserver-users] MapServer 4.8.3: MapScript setProjection

[Simon Greig]

Hi,

This is a follow up to a question a colleague asked a few weeks ago:
http://lists.osgeo.org/pipermail/mapserver-users/2008-March/054772.html

To summarise:

In order to improve performance in our java application that uses the 
mapscript API we have replaced:

mapobj.setProjection("init=epsg:27700");

with

private static final String PROJECTION_WK_EPSG_27700 = "PROJCS[\"OSGB 1936 
/ British National Grid\",GEOGCS[\"OSGB 
1936\",DATUM[\"OSGB_1936\",SPHEROID[\"Airy 
1830\",6377563.396,299.3249646,AUTHORITY[\"EPSG\",\"7001\"]],AUTHORITY[\"EPSG\",\"6277\"]],PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],UNIT[\"degree\",0.01745329251994328,AUTHORITY[\"EPSG\",\"9122\"]],AUTHORITY[\"EPSG\",\"4277\"]],UNIT[\"metre\",1,AUTHORITY[\"EPSG\",\"9001\"]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"latitude_of_origin\",49],PARAMETER[\"central_meridian\",-2],PARAMETER[\"scale_factor\",0.9996012717],PARAMETER[\"false_easting\",400000],PARAMETER[\"false_northing\",-100000],AUTHORITY[\"EPSG\",\"27700\"]]";

...

mapobj.setWKTProjection(PROJECTION_WK_EPSG_27700);


We have also changed the code to use the WKT projection method for each 
layer.

As Rob says the performance improvement is way better and we thought we 
had a winner. 
Unfortunately we have a problem based on the size of the image and 
bounding box. 

If we ask for a small bounding box (roughly 1 mile by 1 mile) with a 
1000x800 PNG image then it works
If we ask for a large bounding box (roughly 500 miles by 500 miles) with a 
200x200 PNG image then it works
If we ask for a large bounding box with a 300x300 PNG image then we get 
this error:

"Layer must have an EPSG or AUTO projection code (in its PROJECTION object 
or wms_srs metadata)"


Unfortunately Rob is on leave and I am looking after things in his 
absence.  Any help is much appreciated :-)






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